From c9b3d25c5336d2be0e124eba6886c9397f28ed3b Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Jonathan=20G=C3=B3mez?= <jonicgp97@gmail.com>
Date: Tue, 1 Oct 2019 08:04:18 -0500
Subject: [PATCH] Create RomanToDecimal.js

Conversion from Roman numeral system to decimal
---
 Conversions/RomanToDecimal.js | 38 +++++++++++++++++++++++++++++++++++
 1 file changed, 38 insertions(+)
 create mode 100644 Conversions/RomanToDecimal.js

diff --git a/Conversions/RomanToDecimal.js b/Conversions/RomanToDecimal.js
new file mode 100644
index 000000000..812b5220a
--- /dev/null
+++ b/Conversions/RomanToDecimal.js
@@ -0,0 +1,38 @@
+var values = {
+  'I':1,
+  'V':5,
+  'X':10,
+  'L':50,
+  'C':100,
+  'D':500,
+  'M':1000
+};
+
+function romanToDecimal(romanNumber){
+  let prev = ' ';
+
+  let sum = 0;
+
+  let newPrev = 0;
+  for(let i = romanNumber.length - 1; i >= 0; i--){
+    let c = romanNumber.charAt(i);
+
+    if(prev !== ' '){
+      newPrev = values[prev] > newPrev ? values[prev] : newPrev;
+    }
+
+    let currentNum = values[c];
+    if(currentNum >= newPrev){
+      sum += currentNum;
+    } else {
+      sum -= currentNum;
+    }
+    
+    prev = c;
+  }
+  return sum;
+}
+
+console.log(romanToDecimal('XXIIVV'));
+console.log(romanToDecimal('MDCCCIV'));
+console.log(romanToDecimal('XXIVI'));